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Maintenance construction scheme of LX type electric single beam suspension crane.

   发布时间:2018年01月30日

In order to ensure that LX electric single-girder suspension crane installation work smoothly, make the crane during the installation process, through the process in a safe and orderly work state, it must be planed, organized, orderly construction, let each homework personnel to accomplish know fairly well, handy, formulated the following construction scheme:

1. Installation overview of LX electric single beam suspension crane.

The machine starts weight Q=3 tons, span L=13.5 meters, hoisting height H=9 meters, and large car running at 20 meters per minute.

Preparation before installation.

(1) installation site selection.

The installation site should have enough area to meet the needs of the installation and flip lifting. The site should be equipped with a power supply to connect the welding machine and other power tools.

(2) preparation of equipment and tools.

We need 2 sets of welding machine, 2 sets of oxygen acetylene, 2 sets of hand-pull gourd, wooden ladder, and crane and crane.

(3) preparation of materials.

The steel rails, pressboard, plywood, bolts, and the materials and welding rods used in the construction of this project shall be prepared according to the actual requirements.

(4) personnel arrangement

Personnel involved in the current project: 2 electricians, 2 fitters, 2 welders, 2 heavy industries and 1 safety manager.

3. Basic safety requirements during installation.

The construction personnel participating in this project strictly abide by the safety operation procedures of all kinds of work.

4. The process of installation.

(1) installation of the track: firstly, the site shall be cleaned and the cement bearing foundation shall be checked and accepted. Leveling and setting. The inspection and alignment of the rail, the connection between the upper rail and the rail joint, the alignment and reinforcement, the measurement and inspection, leveling and straightening. Car stop making installation, the installation of the track standards to qualify for TJ231-78 "mechanical equipment installation engineering construction acceptance specifications" the provisions of the standard, the whole journey is not more than 10 mm, the difference between the highest and lowest joint of the left, right, offset, on the face are not greater than 1 mm, joint clearance is not greater than 2 mm, span deviation should not be greater than 5 mm, with cross two parallel track elevation relative difference, in the post should not be greater than 10 mm, other place should not be greater than 15 mm.

(2) installation of slide wire.

The contact surface of the slip line shall be flat, straight, non-corrosive, conductive and suitable for installation. The compensation device shall be set in the expansion joints of the building. The power line is painted in red paint on non-conductive contact surfaces, and safety signs or electrically charged indicators are installed in appropriate locations. If the safety slip is installed, it should be straight and conductive. If the cable is supplied with soft cable, the line number should meet the requirements and set the traction rope.

(3) erection of bridge of crane.

Before installation should be in conjunction with the entrusted installation unit, and representatives of manufacturing units together out of the box, according to the random packing belt, count and check the goods are in conformity with the number of parts listed in the packing list whether, whether random file is complete, after the check, make records, signed by three parties representative on the spot, the bridge of assembly and erection of all the participants in the construction personnel to strictly abide by rules of safe operation of each type of work, it is forbidden to violate the rules and regulations

Crane assembly, want to put the bridge according to the working position in pad on the shelf, fixed firmly, put end beam, measuring diagonal is poor, should not be greater than 5 mm, span should not be greater than 3 mm, completely conform to the rules, then assembling electric hoist, trolley running clearance should not be greater than 5 mm, final assembly control room.

(4) electrical installation

Before installation, should be familiar with electrical schematic diagram, wiring diagram, electrical general drawing and relevant technical data to understand the operation principle and the function of each element. In order to accurately install and quickly process problems during installation. Check that all electrical components and motors should be no less than 0.8 megaohm for the geo-resistance. In humid environment, should not be less than 0.4 megohm, check whether the lines are correct, and confirm no error rate, before the power test run. During the test run, check whether the running direction is consistent, whether the travel switch is in accordance with the required direction, and whether the upper and lower power failure limits are safe and reliable. All safety devices must be safe and reliable before hoisting and erection. In the process of hoisting, strict compliance with safe operating procedures is strictly prohibited.

5. The electric shell and wire tube of the crane shall be reliably grounded, and the grounding resistance of the crane rails and any point on the crane shall not be greater than 4 ohms. Repeated grounding resistance is not greater than 10 ohms. The main circuit and the control circuit are not less than 0.8 megabytes to the ground insulation resistance.

6. After the test of the crane is qualified, it shall be carried out without load test, static load test and dynamic load test. After self-inspection, fill in the completion report carefully, inform party a, organize relevant department to accept and accept, and deliver the product after qualified.